Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Schedule of Distributions On Common Stock (Parenthetical) (Detail)

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Stockholders' Equity - Schedule of Distributions On Common Stock (Parenthetical) (Detail)
12 Months Ended
Dec. 31, 2015
Equity [Abstract]  
Percentage of qualified dividends 98.53746%